#include "stdafx.h"

/*  -- translated by f2c (version 19940927).
   You must link the resulting object file with the libraries:
	-lf2c -lm   (in that order)
*/

#include <math.h>
#include "hnum_f2c.h"
namespace harlinn
{
    namespace numerics
    {
        namespace SuperLU
        {
            doublereal dznrm2_(integer *n, doublecomplex *x, integer *incx)
            {


                /* System generated locals */
                integer i__1, i__2, i__3;
                doublereal ret_val, d__1;

                /* Builtin functions */
                //double d_imag(doublecomplex *), sqrt(doublereal);

                /* Local variables */
                static doublereal temp, norm, scale;
                static integer ix;
                static doublereal ssq;


            /*  DZNRM2 returns the euclidean norm of a vector via the function   
                name, so that   

                    DZNRM2 := sqrt( conjg( x' )*x )   



                -- This version written on 25-October-1982.   
                    Modified on 14-October-1993 to inline the call to ZLASSQ.   
                    Sven Hammarling, Nag Ltd.   


    
                Parameter adjustments   
                    Function Body */
            #define X(I) x[(I)-1]


                if (*n < 1 || *incx < 1) {
	            norm = 0.;
                } else {
	            scale = 0.;
	            ssq = 1.;
            /*        The following loop is equivalent to this call to the LAPACK 
  
                        auxiliary routine:   
                        CALL ZLASSQ( N, X, INCX, SCALE, SSQ ) */

	            i__1 = (*n - 1) * *incx + 1;
	            i__2 = *incx;
	            for (ix = 1; *incx < 0 ? ix >= (*n-1)**incx+1 : ix <= (*n-1)**incx+1; ix += *incx) {
	                i__3 = ix;
	                if (X(ix).r != 0.) {
		            i__3 = ix;
		            temp = (d__1 = X(ix).r, abs(d__1));
		            if (scale < temp) {
            /* Computing 2nd power */
		                d__1 = scale / temp;
		                ssq = ssq * (d__1 * d__1) + 1.;
		                scale = temp;
		            } else {
            /* Computing 2nd power */
		                d__1 = temp / scale;
		                ssq += d__1 * d__1;
		            }
	                }
	                if (d_imag(&X(ix)) != 0.) {
		            temp = (d__1 = d_imag(&X(ix)), abs(d__1));
		            if (scale < temp) {
            /* Computing 2nd power */
		                d__1 = scale / temp;
		                ssq = ssq * (d__1 * d__1) + 1.;
		                scale = temp;
		            } else {
            /* Computing 2nd power */
		                d__1 = temp / scale;
		                ssq += d__1 * d__1;
		            }
	                }
            /* L10: */
	            }
	            norm = scale * sqrt(ssq);
                }

                ret_val = norm;
                return ret_val;

            /*     End of DZNRM2. */

            } /* dznrm2_ */
        };
    };
};